Molecular weight dependence of exciton diffusion in poly(3-hexylthiophene)

Mohammad Khairul Zarifi Haji Masri, Arvydas Ruseckas, Evguenia V. Emelianova, Linjun Wang, Ashu K. Bansal, Andrew Matheson, Henrik T. Lemke, Martin M. Nielsen, Ha Nguyen, Olivier Coulembier, Philippe Dubois, David Beljonne, Ifor D. W. Samuel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

A joint experimental and theoretical study of singlet exciton diffusion in spin-coated poly(3-hexylthiophene) (P3HT) films and its dependence on molecular weight is presented. The results show that exciton diffusion is fast along the co-facial pi-pi aggregates of polymer chromophores and about 100 times slower in the lateral direction between aggregates. Exciton hopping between aggregates is found to show a subtle dependence on interchain coupling, aggregate size, and Boltzmann statistics. Additionally, a clear correlation is observed between the effective exciton diffusion coefficient, the degree of aggregation of chromophores, and exciton delocalization along the polymer chain, which suggests that exciton diffusion length can be enhanced by tailored synthesis and processing conditions.

Original languageEnglish
Pages (from-to)1445-1453
Number of pages9
JournalAdvanced Energy Materials
Volume3
Issue number11
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Polythiophene films
  • Conjugated polymers
  • Charge-transport
  • Photogeneration
  • Transistors
  • P3HT/PCBM
  • Blends
  • Length
  • Rates

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